Problem statement: Hybrid Optical Code-Division Multiple-Access (OCDMA) and Wavelength-Division Multiplexing (WDM) have flourished as successful schemes for expanding the transmission capacity as well as enhancing the security for OCDMA. However, a comprehensive review related to this hybrid system are lacking currently. Approach: The purpose of this paper is to review the literature on OCDMA-W...

We present the architecture and code design for a highly scalable, 2.5 Gb/s per user optical code division multiple access (OCDMA) system. The system is scalable to 100 potential and more than 10 simultaneous users, each with a bit error rate (BER) of less than 10. The system architecture uses a fast wavelength-hopping, time-spreading codes. Unlike frequency and phase sensitive coherent OCDMA s...

با ظهور جدیدترین مرحله سرمایه داری یا به گفته فرانکو بیفو براردی، عصر "نشانه-سرمایه داری"، شاهد تغییرات زیادی در بستر اقتصادی، اجتماعی و سیاسی جوامع بوده ایم. مقاله حاضر تلاش می کند چنین بستری تکیه بر نظریات براردی برخی از عناصر موضوعی ساختاری رمان های دیوید فاستر والاس را عنوان یکی شاخص ترین نویسندگان پسا پست مدرن آمریکایی مورد بررسی قرار دهد. این امر تحلیل امکان ماهیت مشارکت نظر گرفتن تاثیرسا...

We compare the achievable load of three types of overloaded signature sets with multistage successive interference cancellation: random spreading (PN), WelchBound-Equality (WBE) sequences and overall permuted OCDMA/OCDMA (o-O/O) or PseudoNoise/OCDMA (PN/O). It is found that o-O/O outperforms PN and WBE for spreading factors N, varying from 16 to 256.

The performance comparison of different OCDMA schemes is addressed in this paper. As the result, the merits of coherent 1-D time-spreading and spectral coding schemes and incoherent 2-D scheme are highlighted. The keys towards practical OCDMA networks are discussed in terms of en/decoder, optical sources, optical thresholding as well as multiple access interferences and beat noise suppression. ...

This paper focuses on the effect on BER, Q-Factor for a four user OCDMA communication system with varying Jitter. Performance of the OCDMA communication system has been evaluated in terms of bit error rate and Q factor with jitter varying from 0 pico-seconds to 3.0 picoseconds in steps of 0.5 pico-seconds. Simulations were carried out using commercially available simulator from Rsoft, OPTSIM. K...

A multiple access scheme referred to as IDMA (interleave-division multiple-access) is combined with OCDMA (CDMA with orthogonal spreading sequences) to obtain a new hybrid multiple access scheme referred to as OCDMA/IDMA. The new scheme is shown to outperform IDMA for a sufficiently large number of users and asymptotically approaches single user performance even for a bit load of as high as 3.7...

Code pulses of a spectral amplitude coding/optical code division multiple-access (SAC/OCDMA) system are overlaid onto a multichannel wavelength division multiplexing (WDM) system. Modified quadratic congruence (MQC) codes are developed as the signature codes for the SAC/OCDMA system. The developed code is to avoid the overlapping between signals of both systems with no use of notch filters. In ...

As a scheme of multiple access, Optical Code Division Multiple Access (OCDMA) technology has many outstanding advantages such as large capacity, high security and excellent anti-interference ability, which make OCDMA a forefront topic of research in all-optic access networks. In this thesis, we introduce OCDMA technology in detail, especially 2-Dimensional (2D) OCDMA system. A novel signature c...

We present performance limits of the optical code-division multiple-access (OCDMA) networks. In particular, we evaluate the information-theoretical capacity of the OCDMA transmission when single-user detection (SUD) is used by the receiver. First, we model the OCDMA transmission as a discrete memoryless channel, evaluate its capacity when binary modulation is used in the interference-limited (n...